Citing public safety concerns, Montebello police said officers entered the unit the suspect was holed up in and deployed tear gas to take the suspect into custody around 7 p.m.
Montebello Police Department officers responded to an apartment complex in the area of Greenwood Avenue between Washington Boulevard and Oakwood Street around 4 p.m.
The area affected was shut down to traffic due to the incident. Several officers as well as a K-9 unit were at the scene.
Residents of the apartment complex were evacuated to Chet Holifield Park as a precaution.
Police were negotiating with the suspect and were monitoring the situation, along with social service workers.
The suspect was being treated at the scene. No other injuries were reported.